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A GPT that implements a photo face-blurring app

A case of using GPT to build an app that obscures photos so strangers' faces are not identifiable.

How it works

  1. Simon Willison asked GPT-6 Astra to build an app to obscure faces before sharing photos taken at a protest.
  2. The published Photo Scrubber detects and blurs faces in the browser and lets users manually adjust the areas to obscure.

Results

The author published an experimental tool that removes photo metadata and exports redacted images.

Notes

It uses MediaPipe and BlazeFace. The tool is described as experimental, and no face-detection accuracy figures were published.

Source

Simon Willison Original post ↗

Example prompt · ChatGPT

Please implement a local web tool in [target browser] for obscuring faces and personal information in photos. The input is [test photo]; before using photos of real people, check where processing happens and whether there is any external communication. Consider using MediaPipe and BlazeFace and explain currently supported packages and model-loading methods. Arrange the interface around file selection, face detection, blur strength adjustment, manual selection of additional areas to obscure, and export of images with metadata removed. Have a person check faces missed by detection, and do not guarantee that all faces are automatically obscured. Provide runnable code and usage instructions. Use [photo with multiple faces] and [photo without faces] to check the output files, metadata removal, and preservation of the originals.